38°16'18"N | 89°40'34"W

Prairie State Energy Campus, Illinois, USA Overview

Scope of Work Engineering, procurement, construction, and startup
Schedule 2007–2012
Business Infrastructure

One of the cleanest coal plants in the nation

Bechtel built the Prairie State Energy Campus, the largest greenfield coal-fired power plant built in the United States since the early 1990s. By combining highly efficient pulverized coal technology and supercritical (extremely high-temperature and pressure steam cycle) boilers with advanced emission controls, Prairie State’s carbon-dioxide emissions are 15 percent less than those emitted by comparable plants. The result: one of the cleanest coal plants in the nation.

Comprising two 800-megawatt power units southeast of St. Louis, Missouri, Prairie State is fueled by coal from a mine at the site. Electricity from the plant is distributed to eight Midwestern-based public power utilities serving nine states. The utilities, along with coal producer Peabody Energy, own the facility.

Inside the Project

Prairie State Energy Campus by the numbers

  • 2,700 construction workers
  • 42,000 tons of steel
  • 165,000 cubic yards (more than 126,000 cubic meters) of concrete―enough to fill more than 50 Olympic-size swimming pools
  • 120 miles (more than 190 kilometers) of piping
  • 1,200 miles (more than 1,930 kilometers) of electrical cable
  • 1,600 megawatts of power 

Construction of the Prairie State campus

What makes Prairie State Energy Campus among the cleanest U.S. coal-fired plants?

Clean electricity is generated at Prairie State using five technologies:

  1. Nitrogen oxide controls

  2. Selective catalytic reduction reduces NOx to state-of-the-art values

  3. Dry and wet electrostatic precipitators eliminate 99.9 percent of particulates

  4. Sulfur-dioxide scrubbers remove SO2 from the flue gas

  5. Powdered-activated-carbon injection removes 90 percent of the mercury emissions

Prairie State Energy Campus

Quick trip cuts costs and improves carbon footprint

Prairie State's coal comes from a mine located across the road from the power plant. Coal travels on conveyors from the coal field to the plant, cutting out the need for transport by rail or barge. This significantly reduces emissions and saves on transportation costs. 

How it works

The plant uses coal that’s been pulverized to about the consistency of talcum powder and used as fuel for a boiler to heat water and produce steam. The steam drives a turbine, which, in turn, drives an electrical generator, sending electricity throughout the grid to Midwest families and businesses.

Why it Matters

Prairie State commissioned a study by the University of Illinois that estimated Prairie State's economic impact on the region at more than $785 million annually.

Aerial view of Prairie State Energy Camputs

Sustainable and secure energy

Building Prairie State Energy Campus was an important step toward creating a sustainable and secure energy future for the United States. It uses domestic coal resources and clean-generation technologies to produce electricity in a more efficient and environmentally friendly manner.

Prairie State will have an estimated $22 billion economic impact over the next 30 years.
Prairie state power plant

Higher output

Tests determined that the power plant has an output capability is almost 2 percent higher than its nameplate capacity and almost 2 percent more efficient.

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